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John: My plow was a model 510, 5x16. The Super Chief bottoms however would be same as yours. I had my plow about two years, came home from IH dealer one day with a new set of shares and bolts. As I changed them, I noticed this right hand thread was different, dealer had always given me left hand thread bolt in the past. I started plowing, and within an hour I had a share hanging, went back to investigate. All five were loose. Tightened them, and since I had lost bolts on the one hanging, I had to replace those with the old left hand thread bolts. An hour later I stopped to check again, share with the left thread was tight, but the rest were all loose again. I went to phone, called the IH parts man, told him my problem. He did a bit of reading and got back to me in 5 min. This dealer had sold his first roll over plow, IH had added right hand thread bolts to his parts inventory. I had gotten there before parts man had got to his new reading material, thus bolts were given to me without checking. The new reading material I refered to was, " Right turning Super Chief moldboards must have left hand thread bolts and Left turning moldboards must have right hand thread bolts. It works, I can tell you the bolts need to be little more than finger tight. I have never owned a roll over plow. The 510 probably plowed 5,000 acres during time I had it and never lost a share with left hand thread bolts in right turning moldboards.
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